Half to feedeeick l



2 Sheets-Sheet 2.

(No Model.)

Scroll Saw.

' No. 237,912. Patented Feb. 15,1881.

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FRIEDERIOH SOHAEFLE, OF ALTIMORldMAYLAl-D, ASSIGNOR OF ONE- HALF TOFREDERICK L. VOLZ, OF SAME PLACE.

SCROLL-SAW.

SPECIFICATION forming part of Letters Patent No. 237,912, dated February15, 1881.

Application filed November 29, 1880.

To all whom it may concern Be it known that I, Fnrnnnnrcn SGHAEFLE, acitizen of the German Empire, residing at Baltimore, in the county ofBaltimore and State of Maryland, have invented certain new and usefulImprovements in Scroll-Saws; and I do hereby declare the following to beafull,clear, and exact description of the invention, such as will enableothers skilled in the art to which ro it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor igures of reference marked thereon, which form a part ofthissliecification.

This invent-ion relatestto certain improvements combined in a gig-sawingmachine of that class in which the saw is adapted to be revolved whileit reciprocates.

The improvement will-irst be described, and the invention thendesignated in the claims.

In the accompanying drawings, Figure l is a front elevation of a machineembodying the invention. Fig. 2 is a side elevation of same. Fig. 3 is adetail view, larger scale, of upper slide-rod. Fig. 4 is a cross-sectionof same,v z5 showing guide-rollers. Fig. 5 is a front view of lowerslide-rod and guides.V Fig. 6 is a transverse view of same. Fig. 7 is atop view of cross-head and guides; Fig. S is a crosssectiou ofslide-rod, showing the bevel-wheel 3o and feather. Figs. 9 and l0 areviews of the double ratchet-wheel, pawls, and weights.

The letterA designates an ordinary saw; B, the table; O, the frame bywhich the Lipper end of the saw is supported. Each end of the 3 5 saw isattached to avertically-sliding rod,`the upper one being designatedbythe letter A', and the lower one by the letter A2. In crossvsectionthese rods are round, in order that they may both slide and turn intheir station- 4o ary guides c. Each rod has a groove, a, ex-

tending lengthwise, for a purpose hereinafter named. The upper end ot'the upper. rod has a hook, b, swiveled thereto. A pulley, D, is

mounted on a standard, D', upon the top of the frame, and a band, c, ofany suitable material is attached by one end to the hook and passed overthe pulley, and by theother end to the movable end of a pivoted arm,`E,on which a spring, d, acts to keep'said end of the arm 5o normallydepressed. This arm, by drawing (No model.)

constantly on the band, serves to keep the saw taut or strained on itsupward stroke. The lower rod4 has a cross-head, F, secured to it, whichslides up and down in guides ff. Attached to the cross-head is a pin, g,to which the pitman G connects. The other end of the pitm an isattachedto the crank-head h, mounted on the drive-shaft h,to which power isapplied by the pulley i.

To cause the saw to revolve or partly revolve 6o while in motion, abevel-gear wheel, J, is provided and placed to turn in a horizontalplane,

-and has a-central eye, through which the upper slide-rod passes. A lugor feather, 7c, (see Fig. 8,) secured in the eye of the wheel, fits inthe groove a of the rod, and prevents therod from turning'withiu theeye,but allows it to slide freely endwise. This wheel is held to itsseat by a curved plate, m, and gears with a wheel, u, mounted on ahorizontal shaft, n. 7o Another bevel-gear wheel, J', is placed to turnin a horizontal plane, and is constructed`with an eye and featherexactly like' the wheel J, and vthrough the said wheel J' the lowersliderod, A2, passes. This wheel is sustained between the guide c andthe hanger or bracket m', (see Fig. 5,) and gears with a wheel, p,mounted on a horizontal shaft, p. At the end of each of the shafts n'and p' 'is a bevel-gear wheel, (designated, respectively, n2 'and 192.)A 8o vertical shaft, L, carries two bevelgears, J2 and J3, which areengaged with the wheels n2 and p2. The lower end of the vertical shaftis sustained by the step q, and near the lower end acrown doubleratchet-wheel, N, is secu red. 8 5 Two arms, P, are each separatelypivoted by one end to the vertical shaft L, just above the crownratchet-wheel, and each arm carries at its extremity a pawl, r, whichengages with one of the two circles of ratchet-teeth. One arm 9o andpawl is arranged to turn the wheel in one direction, and the other armand pawLin the opposite direction.

Upon the floor, at the front of the machine, are two treadles, s, shapedlike a bell-crank lever. From the upward-projectin g part of each of thetreadle-levers a cord, t, extends back and over the ratchet-wheel, andto each of the cords one ofthe pawls r is attached. The cord thencepasses over a pulley, u, suspended Vfrom a hangroo er, u', and at theend of each cord a wei ght,V, is suspended. rIhe weights draw the armsI? and pawls back, so that the normal position 'of the arms is indicatedby the dotted lines in Fig. 10. The depression of the righthand treadlewill cause the ratchet-wheel to be partly turned lfrom the right sidetoward the front of the machine, and upon thefoot being raised theweight V will draw the pawl back, when the ratchetwheel may be furtherpartly turned by again depressing the treadle. Vhenever the ratchetwheelis turned the vertical shaft Ii is also turned, and this, through themedium of the bevel-gears above and below, effects the turning of thesaw, as will be readily understood. By this mechanism the saw may beturned in either direction partly or entirely around while reciprocatinFrom an arm or hanger, IV, attached to the front of the frame, twogrooved rollers, x, are mounted side by side, with their grooved facesconfronting each other, as shown in Figs. 1, 2, 3, and 4. These rollersserve as a guide for the upper slidefrod, A'.

I do not claim, broadly, treadles for revolving the gig-saw, as I amaware such have been used in combination before.

Having described my invention, I claim and desire to secure by LettersPatentof the United States- 1. In a gig-sawing machine, the combinationof a sliding saw-rod, A', round in cross-section, a grooved roller, x,on each of two sides ofthe rod, with their grooved faces confrontingeach Other, a wheel, J, through which the sliding rod may move freelyendwise without turning, and mechanism, substantially as described, torotate the wheel and sawrod, as set forth.

2. In a gig-sawing machine, the hereiirdescribed means for revolving thesaw while it reeiproeates, consisting of a vertical shaft, L, connectedwith theyertically-shding saw-rods A' A2, a ratchet-wheel, N, to rotatethe shaft, two arms, I), each pivoted by one end to the vertical axisabove the ratchet-wheel, and each carrying at its other end a pawl, r,to engage with the ratchet-wheel, a weightconnected with each arm todraw it back, and a treadle connected therewith to draw it forward, asset forth.

In testimony' whereof I affix my signature in presence of two witnesses.

FRIEDERIOH SCIIAEFLE.

Witnesses Gmo. MCGAFFRAY, L. H. ROBINSON.

